Question: When did Cesar Franck become a citizen of the United Kingdom of the Netherlands?
Paraphrase: Cesar Franck received his citizenship of the United Kingdom of the Netherlands in what year?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q50187 p:P27 ?s . ?s ps:P27 wd:Q15864 . ?s pq:P580 ?value}